The last avalanche forecast for the 2023-2024 season will post on April 21st. Thank you to all who contributed to the avalanche center this season through observations, volunteer time, and/or financial contributions.

Cornice Collapses and Wet Loose Avalanches on Donner Peak

Location Name: Donner Peak Region: Donner Summit Area Observation Date & Time: Monday, April 10, 2023 - 15:00
Location: 39.311544, -120.313291 See map: CalTopo	Is this an Avalanche Observation?: Yes Conditions Alerts: Avalanche Activity Rapid or Prolonged Warming Rapid or Prolonged Warming›Rollerballs / Pinwheels Rapid or Prolonged Warming›Strong Sunshine Rapid or Prolonged Warming›Warm Temperatures Terrain Alerts: Slopes Steeper than 30 degrees Obvious Slide Path Trigger Points Terrain Traps Terrain Matches the Advisory

Observation made by: Forecaster

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Observation

Description of Snow, Weather, and Avalanche Conditions:

Driving up to Johnson Canyon on 4/11/23, I saw several new cornice collapses and wet loose avalanches on Donner Peak that must have happened during the afternoon on 4/10/23. I could also see glide cracks around the rocks.

Avalanche Details

Avalanche Type:

Wet Loose

Additional number of similar avalanches:

Trigger

Trigger:

Natural

Terrain

Start Zone Slope Angle:

40degrees

Aspect:

Northeast

Starting Elevation:

near-treeline

Size

Destructive Size:

D2 Could bury, injure, or kill a person.

Relative Size:

R3 Medium

Avalanche Width (Average width):

60ft.

Avalanche Length (Vertical Run):

800ft.

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Cornice Collapses and Wet Loose Avalanches on Donner Peak

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Cornice Collapses and Wet Loose Avalanches on Donner Peak

Conditions Alerts:

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